Spiralling up, raven is a climber of sorts (7)

I believe the answer is:

parvenu

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'climber of sorts' is the definition.
'parvenu' can be an answer for 'climber' (I've seen this before). I am unsure of the 'of sorts' bit.

'spiralling up raven' is the wordplay.
'up raven' anagrams to 'PARVENU'.
Though, I am unsure how this is indicated.

'is a' acts as a link.

Can you help me to learn more?

(Other definitions for parvenu that I've seen before include "Arriviste" , "One coming" , "Social climber" , "Newcomer" , "Johnny-come-lately, upstart" .)

I've seen this clue in The Everyman puzzle in The Observer.

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